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Mortgage Loans Payable and Unsecured Credit Facilities (Effect of Derivative Financial Instruments on Consolidated Statements of Operations and Consolidated Statements of Equity) (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Designation/Cash Flow [Member] | Interest Rate Swap [Member]      
Derivative Instruments Gain Loss [Line Items]      
Net amount of Gain (loss) recognized in other comprehensive income (effective portion) $ 2,942,000 $ 1,162,000 $ (4,539,000)
Continuing Operations [Member]      
Derivative Instruments Gain Loss [Line Items]      
Net amount of (Loss) recognized in other comprehensive income reclassified into earnings (effective portion) $ (2,345,000) $ (3,739,000) $ (3,621,000)